CVE-2026-33515

Name: CVE-2026-33515
Creator: NVD / NIST
Published: 2026-03-26T01:16:27.69+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2026-33515 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

Squid is a caching proxy for the Web. Prior to version 7.5, due to improper input validation, Squid is vulnerable to out of bounds read when handling ICP traffic. This problem allows a remote attacker to receive small amounts of memory potentially containing sensitive information when responding with errors to invalid ICP requests. This attack is limited to Squid deployments that explicitly enable ICP support (i.e. configure non-zero `icp_port`). This problem cannot be mitigated by denying ICP queries using `icp_access` rules. Version 7.5 contains a patch.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS 4.0

6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

1.04%

59.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Squid-Cache	Squid	< 7.5

References

https://github.com/squid-cache/squid/commit/8138e909d2058d4401e0ad49b583afaec912b165Patch
https://github.com/squid-cache/squid/pull/2220Issue Tracking
https://github.com/squid-cache/squid/pull/2220#discussion_r2727683637Issue Tracking
https://github.com/squid-cache/squid/security/advisories/GHSA-84p4-hcx7-jj7cVendor Advisory
http://www.openwall.com/lists/oss-security/2026/03/25/4Mailing List, Third Party Advisory

Timeline

Published: Mar 26, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-33515?

How severe is CVE-2026-33515?

CVE-2026-33515 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2026-33515?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-33515?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST